MIL-PRF-83990A
to limit the heat loss of the oven to no more than 0.050 kW (171 BTU) per hour per square foot of
oven interior surface at maximum operating temperature.
3.5.11 Temperature indicator. The oven shall be equipped with a digital or analog
temperature indicator. The instrument shall be graduated in degrees F and shall be positioned to be
read easily. The temperature indicator may be an individual unit or combined with the thermostat.
3.5.12 Thermostat. The oven temperature adjustment shall be by means of a thermostat
control. The thermostat shall be capable of automatically maintaining the oven temperature as set
to within ± 10 degrees F. The thermostat control shall be located on the outside of the oven and
shall be fully enclosed to protect the instrument against dust, dirt, moisture or corrosive media.
The thermostat sensing element shall be suitably located inside the oven to ensure sensitivity to
overall oven temperature fluctuations.
3.5.13 Heating units. The oven heating units shall be located in such a manner as to preclude
direct radiant energy to the oven work space. The number and size of the elements shall be
sufficient to raise and stabilize the oven temperature from ambient level to maximum operating
temperature in fifty minutes. The heaters shall conform to the requirements of NFPA 86D.
3.5.14 Excess temperature cut-out. An excess temperature cut-out shall be provided which is
adjustable over a minimum range of 150 degrees F below to 50 degrees F above the maximum
operating temperature of the oven. The cut-out shall function to remove power from the oven when
the set over-temperature point is reached. The power shall remain off until manually reset and
shall comply with NFPA 86D requirements.
3.5.15 Over-current protection. Over-current protection for each major element in the heater
circuit(s) shall be in compliance with NFPA 70, National Electrical Code.
3.5.16 Cut-out switch. The oven shall have a cut-out switch that disconnects power from the
heating units when one or both doors are opened and reconnects power when the door(s) are
securely closed.
3.5.17 Indicator light. The oven shall be equipped with an indicator light which shall function
when the oven heaters are energized. The indicator light shall be located near the door(s) and be
visible when facing the door(s).
3.6 Electrical Requirements.
3.6.1 Electrical system. The oven electrical system shall comply with the requirements of the
National Electrical Code and NFPA 86D.
3.6.2 Power supply. The oven shall operate on a 230 volt, 60 Hertz, 3 phase power supply,
unless otherwise specified in 6.2.
3.6.3 Wiring. The oven wiring shall be completely enclosed in easily accessible control and
wiring compartment(s) integral with the cabinet. Any wiring exposed to high temperatures shall be
suitably protected.
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